Bluetooth in new vehicle

I bought the car a year ago. I noticed that the on installed navigation/radio/bluetooth system is not working properly. When returned they indicate the unit was faulty and they will replace it. After a long wait and some aggravation with late delivery, people not available etc the eventually fitted the new unit (August 2014) While all the other functions were working the microphone on the unit was still faulty, the unit was also not fitted correctly as the microphone was installed onto the sun visor. When I took the car in recently to check what was wrong they indicated that the unit is faulty again, they will contact me in that week to make arrangement to fix it....I have now waited 1 month and still no call from them. I have contacted the Kia RSA complaint line 2 weeks ago...that has not even assisted in getting things done faster.